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Local sequences are studied, and after considering such factors as the average rate of deposition of the different rocks, their composition, the width and extent of the strata, the fossils contained, and the periods of uplift and erosion, the geological history of the sequence is reconstructed. Lunar stratigraphic systems include the Copernican, Imbrian, and Nectarian archaeology, the order in which cultural layers alternate relative to each other and to the underlying and overlying rocks and deposits. The paleontological method has been extensively employed throughout the Phanerozoic.These sequences are then correlated to those of similar age in other regions with the ultimate aim of establishing a consistent geochronology for the entire earth. The term “stratigraphy” is also applied in English to the study of such a succession of layers. In the older deposits of the Precambrian, the remains of animals are encountered extremely rarely.

Radiocarbon, or carbon 14, is an isotope of the element carbon that is unstable and weakly radioactive. Carbon 14 is continually being formed in the upper atmosphere by the effect of cosmic ray neutrons on nitrogen 14 atoms. when used in direct address ADDITIONAL NOTES FOR TITLES Capitalize very high ranking government officials' titles even when not followed by a name or used in direct address EXAMPLES If no specific individual is referred to, do not capitalize titles of even very high ranking government officials.names of national, political, racial, social, civic, and athletic groups EXAMPLES 11. the first word in a sentence that is a direct quote, even if the direct quote comes in the middle of a sentence EXAMPLE 13. All these methods point to Earth being very, very old -- several billions of years old. Radiometric dating methods are the strongest direct evidence that geologists have for the age of the Earth.

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